.TH WESTON 1 "2019-03-23" "Weston @version@"
.SH NAME
weston \- the reference Wayland server
.SH SYNOPSIS
.B weston
.
.\" ***************************************************************
.SH DESCRIPTION
.B weston
is the reference implementation of a Wayland server. A Wayland server is a
display server, a window manager, and a compositor all in one. Weston has
several backends as loadable modules: it can run on Linux KMS (kernel
modesetting via DRM), as an X client, or inside another Wayland server
instance.

Weston supports fundamentally different graphical user interface paradigms via
shell plugins. Two plugins are provided: the desktop shell, and the kiosk
shell.

Weston also supports X clients via
.BR Xwayland ", see below."
.
.\" ***************************************************************
.SH BACKENDS
.TP
.I drm
The DRM backend uses Linux KMS for output and evdev devices for input.
It supports multiple monitors in a unified desktop with DPMS. See
.BR weston-drm (7),
if installed.
.TP
.I wayland
The Wayland backend runs on another Wayland server, a different Weston
instance, for example. Weston shows up as a single desktop window on
the parent server.
.TP
.I x11
The X11 backend runs on an X server. Each Weston output becomes an
X window. This is a cheap way to test multi-monitor support of a
Wayland shell, desktop, or applications.
.TP
.I rdp
The RDP backend runs in memory without the need of graphical hardware. Access
to the desktop is done by using the RDP protocol. Each connecting
client has its own seat making it a cheap way to test multi-seat support. See
.BR weston-rdp (7),
if installed.
.TP
.I vnc
The VNC backend runs in memory without the need of graphical hardware. Access
to the desktop is done by using the RFB protocol. Currently only one
connecting client is supported. See
.BR weston-vnc (7),
if installed.
.TP
.I pipewire
The PipeWire backend runs in memory without the need of graphical hardware and
creates a PipeWire node for each output. It can be used to capture Weston
outputs for processing with another application.
.TP
.I headless
The headless backend runs in memory. It can be used to capture Weston outputs
or to test client applications.
.
.\" ***************************************************************
.SH SHELLS
Weston's user interface is implemented by individual 'shell' plugins.
A number of shells are provided for different usecases.
.TP
.I desktop
The desktop shell is Weston's default mode. It provides an example of a
desktop-like environment, featuring a panel with launchers and a clock,
a background, and an interactive task switcher. Whilst not intended to be
a full-fledged desktop environment in and of itself, it is an example of
how such an environment can be built.
.TP
.I kiosk
The kiosk shell is intended for environments which want to run a single
application at a time. Applications will be made full screen and
activated as they are started.
.TP
.I fullscreen
The fullscreen shell is a deprecated implementation of the ideas behind
the kiosk shell. It requires specific client support for the
.I zwp_fullscreen_shell_v1
interface.
.TP
.I ivi
The IVI shell is a special-purpose shell which exposes an API compatible
with the GENIVI Layer Manager to user-provided HMI controller modules.
It is intended for use in automotive environments.
.
.\" ***************************************************************
.SH XWAYLAND
Weston can support X11 clients running within a Weston session via an
X server called
.BR Xwayland "."
Xwayland is built as a separate executable, provided by X.Org. Once built
and installed, it can be activated with the
.BR \-\-xwayland
option. Weston will listen on a new X11 display socket and export it
through the
.BR DISPLAY
environment variable.

It has also its own X window manager where cursor themes and sizes can be
chosen using
.BR XCURSOR_PATH
and
.BR XCURSOR_SIZE " environment variables. See " ENVIRONMENT .
.
.\" ***************************************************************
.SH OPTIONS
.
.SS Weston core options:
.TP
\fB\-\^B\fR\fIbackend1,backend2\fR, \fB\-\-backend\fR=\fIbackend1,backend2\fR
Load the comma-separated list of backends instead of the default backend, see
.IR BACKENDS .
The backend modules are searched for in
.IR "@weston_modules_dir@" .
The default backend is
.I @weston_native_backend@
unless the environment suggests otherwise, see
.IR DISPLAY " and " WAYLAND_DISPLAY .
The first backend is the primary backend, and it provides the renderer. Not all
backends support being loaded as secondary backends, which reuse the primary
backend's renderer.
.TP
\fB\-\^c\fR\fIconfig.ini\fR, \fB\-\-config\fR=\fIconfig.ini\fR
Load
.IR config.ini " instead of " weston.ini .
The argument can also be an absolute path starting with a
.IR / .
If the path is not absolute, it will be searched in the normal config
paths, see
.BR weston.ini (5).
This option is ignored if the
.B --no-config
option is passed.
.TP
.BR \-\-debug
Enable debug protocol extension
.I weston_debug_v1
which any client can use to receive debugging messages from the compositor.

.B WARNING:
This is risky for two reasons. First, a client may cause a denial-of-service
blocking the compositor by providing an unsuitable file descriptor, and
second, the debug messages may expose sensitive information.
Additionally this will expose weston-screenshooter interface allowing the user
to take screenshots of the outputs using weston-screenshooter application,
which can lead to silently leaking the output contents.  This option should
not be used in production.
.TP
\fB\-\^f\fIscope1,scope2\fR, \fB\-\-flight-rec-scopes\fR=\fIscope1,scope2\fR
Specify to which scopes should subscribe to. Useful to control which streams to
write data into the flight recorder. Flight recorder has limited space, once
the flight recorder is full new data will overwrite the old data. Without any
scopes specified, it subscribes to 'log' and 'drm-backend' scopes. Passing
an empty value would disable the flight recorder entirely.
.TP
.BR \-\^h ", " \-\-help
Print a summary of command line options, and quit.
.TP
\fB\-\^i\fR\fIN\fR, \fB\-\-idle\-time\fR=\fIN\fR
Set the idle timeout to
.I N
seconds. The default timeout is 300 seconds. When there has not been any
user input for the idle timeout, Weston enters an inactive mode. The
screen fades to black, monitors may switch off, and the shell may lock
the session.
A value of 0 effectively disables the timeout.
.TP
\fB\-\-log\fR=\fIfile.log\fR
Append log messages to the file
.I file.log
instead of writing them to stderr.
.TP
\fB\-\^l\fIscope1,scope2\fR, \fB\-\-logger-scopes\fR=\fIscope1,scope2\fR
Specify to which log scopes should subscribe to. When no scopes are supplied,
the log "log" scope will be subscribed by default. Useful to control which
streams to write data into the logger and can be helpful in diagnosing early
start-up code.
.TP
\fB\-\-modules\fR=\fImodule1.so,module2.so\fR
Load the comma-separated list of modules. Only used by the test
suite. The file is searched for in
.IR "@weston_modules_dir@" ,
or you can pass an absolute path.
.TP
.BR \-\-no-config
Do not read
.I weston.ini
for the compositor. Avoids e.g. loading compositor modules via the
configuration file, which is useful for unit tests.
.TP
\fB\-\-renderer\fR=\fIrenderer\fR
Select which renderer to use for Weston's internal composition. Defaults to
automatic selection.
.TP
\fB\-\-shell\fR=\fIshell\fR
Select which shell to load to provide Weston's user interface. See
.BR ENVIRONMENT "."
.TP
\fB\-\^S\fR\fIname\fR, \fB\-\-socket\fR=\fIname\fR
Weston will listen in the Wayland socket called
.IR name .
Weston will export
.B WAYLAND_DISPLAY
with this value in the environment for all child processes to allow them to
connect to the right server automatically.
.BR \-\-version
Print the program version.
.TP
\fB\-\-wait-for-debugger\fR
Raises SIGSTOP before initializing the compositor. This allows the user to
attach with a debugger and continue execution by sending SIGCONT. This is
useful for debugging a crash on start-up when it would be inconvenient to
launch weston directly from a debugger. There is also a
.IR weston.ini " option to do the same."
.TP
\fB\-\-xwayland\fR
Support X11 clients through the Xwayland server.
.
.SS DRM backend options:
See
.BR weston-drm (7).
.
.SS Wayland backend options:
.TP
\fB\-\-display\fR=\fIdisplay\fR
Name of the Wayland display to connect to, see also
.I WAYLAND_DISPLAY
of the environment.
.TP
.B \-\-fullscreen
Create a single fullscreen output
.TP
\fB\-\-output\-count\fR=\fIN\fR
Create
.I N
Wayland windows to emulate the same number of outputs.
.TP
\fB\-\-width\fR=\fIW\fR, \fB\-\-height\fR=\fIH\fR
Make all outputs have a size of
.IR W x H " pixels."
.TP
.B \-\-scale\fR=\fIN\fR
Give all outputs a scale factor of
.I N.
.TP
.B \-\-use\-pixman
Deprecated in favour of the
.BI \-\-renderer
option.  Use the pixman renderer.  By default weston will try to use EGL and
GLES2 for rendering and will fall back to the pixman-based renderer for
software compositing if EGL cannot be used.  Passing this option will force
weston to use the pixman renderer.
.
.SS X11 backend options:
.TP
.B \-\-fullscreen
.TP
.B \-\-no\-input
Do not provide any input devices. Used for testing input-less Weston.
.TP
\fB\-\-output\-count\fR=\fIN\fR
Create
.I N
X windows to emulate the same number of outputs.
.TP
\fB\-\-width\fR=\fIW\fR, \fB\-\-height\fR=\fIH\fR
Make the default size of each X window
.IR W x H " pixels."
.TP
.B \-\-scale\fR=\fIN\fR
Give all outputs a scale factor of
.I N.
.TP
.B \-\-use\-pixman
Deprecated in favour of the
.BI \-\-renderer
option.  Use the pixman renderer.  By default weston will try to use EGL and
GLES2 for rendering.  Passing this option will make weston use the
pixman library for software compsiting.
.
.SS RDP backend options:
See
.BR weston-rdp (7).
.
.SS VNC backend options:
See
.BR weston-vnc (7).
.
.SS headless backend options:
.TP
\fB\-\-width\fR=\fIW\fR, \fB\-\-height\fR=\fIH\fR
Make the default size of each output
.IR W x H " pixels."
.TP
.B \-\-scale\fR=\fIN\fR
Give all outputs a scale factor of
.IR N "."
.TP
\fB\-\-transform\fR=\fItransform\fR
Transform for the output, which can be rotated in 90-degree steps
and possibly flipped. Possible values are
.BR normal ", " rotate-90 ", " rotate-180 ", " rotate-270 ", "
.BR flipped ", " flipped-rotate-90 ", " flipped-rotate-180 ", and "
.BR flipped-rotate-270 .
.TP
.B \-\-no\-outputs
Do not create any virtual outputs.
.TP
.B \-\-refresh\-rate\fR=\fIN\fR
Give all outputs a refresh rate of
.IR N " mHz (60,000 mHz by default)."
Supported values range from 0 mHz to 1,000,000 mHz. 0 is a special value
that repaints as soon as possible on capture requests only, not on damages.
.
.
.\" ***************************************************************
.SH FILES
.
If the environment variable is set, the configuration file is read
from the respective path.
.PP
.BI $XDG_CONFIG_HOME /weston.ini
.br
.BI $HOME /.config/weston.ini
.br
.
.\" ***************************************************************
.SH ENVIRONMENT
.
.TP
.B DISPLAY
The X display. If
.B DISPLAY
is set, and
.B WAYLAND_DISPLAY
is not set, the default backend becomes
.IR x11 .
.TP
.B WAYLAND_DEBUG
If set to any value, causes libwayland to print the live protocol
to stderr.
.TP
.B WAYLAND_DISPLAY
The name of the display (socket) of an already running Wayland server, without
the path. The directory path is always taken from
.BR XDG_RUNTIME_DIR .
If
.B WAYLAND_DISPLAY
is not set, the socket name is "wayland-0".

If
.B WAYLAND_DISPLAY
is already set, the default backend becomes
.IR wayland .
This allows launching Weston as a nested server.
.TP
.B WAYLAND_SOCKET
For Wayland clients, holds the file descriptor of an open local socket
to a Wayland server.
.TP
.B WESTON_CONFIG_FILE
Weston sets this variable to the absolute path of the configuration file
it loads, or to the empty string if no file is used. Programs that use
.I weston.ini
will read the file specified by this variable instead, or do not read any
file if it is empty. Unset variable causes falling back to the default
name
.IR weston.ini .
.TP
.B XCURSOR_PATH
Set the list of paths to look for cursors in. It changes both
libwayland-cursor and libXcursor, so it affects both Wayland and X11 based
clients. See
.B xcursor
(3).
.TP
.B XCURSOR_SIZE
This variable can be set for choosing an specific size of cursor. Affect
Wayland and X11 clients. See
.B xcursor
(3).
.TP
.B XDG_CONFIG_HOME
If set, specifies the directory where to look for
.BR weston.ini .
.TP
.B XDG_RUNTIME_DIR
The directory for Weston's socket and lock files.
Wayland clients will automatically use this.
.
.\" ***************************************************************
.SH PROGRAM EXECUTION
It is possible to execute a program that will be run by Weston.
.TP
By using this syntax :
weston [options] -- [program [arguments]]
.PP
The '--' here is mandatory to execute a program. There are examples in the
.BR EXAMPLES
section.
.
.\" ***************************************************************
.SH BUGS
Bugs should be reported to
.BR https://gitlab.freedesktop.org/wayland/weston/ "."
.
.\" ***************************************************************
.SH WWW
https://wayland.freedesktop.org/
.
.\" ***************************************************************
.SH EXAMPLES
.IP "Launch Weston with the DRM backend on a VT"
weston
.IP "Launch Weston with the DRM backend and XWayland support"
weston --xwayland
.IP "Launch Weston (wayland-1) nested in another Weston instance (wayland-0)"
WAYLAND_DISPLAY=wayland-0 weston -Swayland-1
.IP "From an X terminal, launch Weston with the x11 backend"
weston
.IP "Launch Weston and make it start weston-terminal"
weston -- /usr/local/bin/weston-terminal
.IP "Launch Weston with the kiosk shell and make it start weston-simple-egl"
weston --shell=kiosk-shell.so -- /usr/local/bin/weston-simple-egl
.IP "Launch Weston with the kiosk shell and open a pdf document with mupdf"
weston --shell=kiosk-shell.so -- mupdf /home/user/Documents/krh/wayland.pdf
.
.\" ***************************************************************
.SH "SEE ALSO"
.BR weston-bindings (7),
.BR weston-debug (1),
.BR weston-drm (7),
.BR weston-rdp (7),
.BR weston-vnc (7),
.BR weston.ini (5)
